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Finding the Fourth Proportional to 479.57, 718.80 and 393.05

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Solution

The fourth proportional to 479.57, 718.80 and 393.05 is: 589.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.57 : 718.80 = 393.05 : x
  2. Step 2: Convert to fraction form
    479.57/718.80 = 393.05/x
  3. Step 3: Cross multiply
    479.57x = 718.80 × 393.05
  4. Step 4: Simplify right side
    479.57x = 282,524.34
  5. Step 5: Solve for x
    x = 282,524.34/479.57
  6. Step 6: Final answer
    x = 589.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.